convertToMarkdown static method

Implementation

static ResultMarkdown convertToMarkdown(MarkdownType type, String data, int fromIndex, int toIndex,
    {int titleSize = 1, String? link, String selectedText = ''}) {
  late String changedData;
  late int replaceCursorIndex;

  final lesserIndex = min(fromIndex, toIndex);
  final greaterIndex = max(fromIndex, toIndex);

  fromIndex = lesserIndex;
  toIndex = greaterIndex;

  switch (type) {
    case MarkdownType.bold:
      changedData = '**${data.substring(fromIndex, toIndex)}**';
      replaceCursorIndex = 2;
      break;
    case MarkdownType.italic:
      changedData = '_${data.substring(fromIndex, toIndex)}_';
      replaceCursorIndex = 1;
      break;
    case MarkdownType.strikethrough:
      changedData = '~~${data.substring(fromIndex, toIndex)}~~';
      replaceCursorIndex = 2;
      break;
    case MarkdownType.link:
      changedData = '[$selectedText](${link ?? selectedText})';
      replaceCursorIndex = 0;
      break;
    case MarkdownType.title:
      changedData = "${"#" * titleSize} ${data.substring(fromIndex, toIndex)}";
      replaceCursorIndex = 0;
      break;
    case MarkdownType.list:
      var index = 0;
      final splitedData = data.substring(fromIndex, toIndex).split('\n');
      changedData = splitedData.map((value) {
        index++;
        return index == splitedData.length ? '* $value' : '* $value\n';
      }).join();
      replaceCursorIndex = 0;
      break;
    case MarkdownType.code:
      changedData = '```${data.substring(fromIndex, toIndex)}```';
      replaceCursorIndex = 3;
      break;
    case MarkdownType.blockquote:
      var index = 0;
      final splitedData = data.substring(fromIndex, toIndex).split('\n');
      changedData = splitedData.map((value) {
        index++;
        return index == splitedData.length ? '> $value' : '> $value\n';
      }).join();
      replaceCursorIndex = 0;
      break;
    case MarkdownType.separator:
      changedData = '\n------\n${data.substring(fromIndex, toIndex)}';
      replaceCursorIndex = 0;
      break;
    case MarkdownType.image:
      changedData = '![${data.substring(fromIndex, toIndex)}](${data.substring(fromIndex, toIndex)})';
      replaceCursorIndex = 3;
      break;
  }

  final cursorIndex = changedData.length;

  return ResultMarkdown(data.substring(0, fromIndex) + changedData + data.substring(toIndex, data.length),
      cursorIndex, replaceCursorIndex);
}